Magnetic clutch



(No Model.) T; J. FAY.

MAGNETIC CLUTCH.

No. 593,571. Pate nted Nov. 16, 1897'. C

i C I INVENTOR C v UNITED STATES PATENT. -OFFICE.

THOMAS JIQFAY, or BROOKLYN, NEW YORK, ASSIGNOR' To run AMERICAN ELECTRICCOLD SUPPLY COMPANY, or MAINE.

MAGNETICCLUTCH.

SPECIFICA'IiOlN-forming part of Letters Patent No. 593,571, datedNovember 16, 1897.

- Application filed February 5, 189% Serial No; ii23,029. (No model) Toall whom-it may concern.-

Be it known that I, THOMAS- J. FAY,a citizen of the UnitedStates,residing at Brooklyn, in the county of Kings and State of New York, haveinvented certain new and useful Improvements in Magnetic Clutches, ofwhich the following is a full, clear, an'd,exact de' seription. L

This invention relates to the transmission of mechanical power bymeansof a magnetic clutch, the object beingto provide for the transference ofpower from one member of the clutch to the other through a stationarydiaphragm without experiencing any inefii- .ciency of the clutch due to"the creating of extra currents in the diaphragm;which would, ifpermitted, engender a force counteracting that of the clutch.

To fully explain the nature and utility of my invention it will benecessary to explain the apparatus or machine with which the clutch isassociated, and this I will do in the detailed description whichfollows, reference being had to the accompanying drawing,

wherein a general plan of the entire appa-.

'ratus is shown, certain parts being insection.

- on. opposite sides with cylinders a, projecting A' is ahermetically-sealed.casing provided from its walls, but openingintotheiin-terior thereof. "In each cylinder is a piston a, providedwith a valve a 0 enin in such a direction that upon the back stroke ofthe piston gas or air in the chamber or cylinder will pass through andin front of the piston,'.

the valves closing on the return stroke. From the cylinders suitableexit-pipes a lead. An

inlet-passage for air orgas is provided at bf The'piston-rods a.connect, respectively, with eccentric-pins 0 upon gears 0, these gearsbeing fixed upon the, opposite ends of a short shaft having its bearingin box (1. Directly under the gears c are pinions e, mounted upon ashaft which hasa bearingin the same pillowblock upon which box d isfixed. This shaft, which is lettered f, carries at one end a softironcross-head g, constituting thearmature of a magnet, as will hereinafterappear. This cross-head is of yoke shape, having two poles facing towardone of the walls of the casing A, in front of which it is adaptedtorotate with very slight clearance.

The apparatus inside of the casing A will compress the gas, which itreceives through passages a to any desired point forconsumpt-ion or use.In some of the arts, such as that or pungent, and it is necessary thatthe machinery and apparatus operating upon it shall leakage. It willtherefore be understood that a means for driving the pump hereindoscribed'from an external source'of power withoutperforati-ng'the wallof the casing for the always leak more or less, is a great desidera tum.Such means have heretofore been invented by me and described in anotherapplication, filed September 30 1896, Serial No. 607,426, the sameconsistin essentially, of an electromagnet mounted to rotate with thedriving-motor, and whose magnetic flux or the casing and acts upon anarmature located therein and carried by the driving-shaft. of thepump.The improvement herein pertains to thisdevice.

of a shaft g. It consists of a core 19 and suitable cdilsp woundthereon. The coreis U- shaped and is arranged with its poles facingtoward the wall of easing A directly 0p osite the soft-iron cross-headg, which constitutes the armature of the magnet. Shaft q is driven by'any suitable source of power, the'pulley q representing such source. Themagnet and with and, from the pump. j V

It has been found in practice that the electromagnet in acting throughthe metallic wall of the ease generates therein electric e urrents, dueto the moving magnetic lines of force, which cut it at right angles;These electric currents travel through the diaphragm in circles alwayssurrounding the path of the lines of force or the core of the magnetand-are known in the art as eddy or Foucault? currents. Apeculiarity ofthese circular cur.-

theinlet 1) and force it outward through the p 1 of refrigeration, thegases used are obnoxious path leads through the unperforated wall of.

be recognizedfat once as a pump adapted to not permit its escape intothe atmosphere by passage of a shaft, the bearing of which would P isan. electromagnet mounted ori the end its armature constitute a clutchadapted to connect and disconnect the sourceof power rents is that theirdirection is always 0 posed to that of the current in the co ls prmarfly -than the rate of increase of the speed, so that with a givenmagnet a speed is soon reached beyond which the clutch will not transmitthe power, and it is proportionally inefiicient for the lower speeds. Iovercome this diificulty by making the wall of the casing through whichthe magnetic clutch acts of material whose electrical conductivity isvery poor, or, to state it another way, whose electrical resistance isvery highviz., too high to permitthe formation of eddy-currents to any appreciable extent. Sucha wall or diaphragm is shown at s. It may be ofhard rubber, fiber, vitreous material or a. composition havingsimilarcharacteristics, or a special me- 7 tallic alloy. A diaphragm of suchmaterial will not lessen the efiiciency of the magnet as a clutch to anyappreciable extent and it may be easilysubstituted for a portion of thewall of the casing A, the joints beinghermetically sealed withoutdifficulty.

It is obvious that a magnetic clutch for the purpose herein set forthmay be made in various shapes and have any suitable number of poles andenergizing-coils.

Having thus described my invention, I claim- The combination of ahermetically-sealed case, a machine therein having a main rotating shaftto be driven, a driving-motor and its rotating shaft located outside ofsaid casing, an electromagnetic clutch having its two members'mountedrespectively on the two retating shafts, one member being inside'thecasing and the other outside thereof, an unperforated wall of the casingcomposed of dielectric material being interposed bctweenrthe two membersof the clutch; and through which the clutching and unclutching of thetwo rotating shafts is effected. I

In testimony whereof I subscribe my signature in presence of twowitnesses.

THOMAS J. FAY. Witnesses:

FRANK S. OBER, HARRY BAILEY.

